Explore topic-wise InterviewSolutions in Current Affairs.

Generally, the proportion of 1:1 of liquid ratio is desirable.

Following the policy of Non-Alignment, India has always condemned colonialism and imperialism.

Correct option is (b) A minimum of public intervention in economic activities.

Dynamic binding means link exist between procedure call and code to be executed at run time when that procedure is call.

Message passing is a method by which an object sends data to another object or requests other objects to invoke a method. This is also known as interfacing.

Correct option is (a) Outplacement

The operators which takes two operands to perform some operation is called a binary operator.

The operators which perform combine or negate the expressions that contain relational operators are called logical operators.

The operators which perform operation of relation between two operands called relational operators.

An operator that takes only one operand to perform some operation is called a unary operator.

The smallest individual units in a program are known as tokens.

The operand is a data item on which the operator performs some activity.

The few tokens are Keywords, identifiers, constants, strings, and operators.

In C++ shorthands means writing the certain type of assignment statements in simplified manner.

An expression is a combination of constants, variables, operators, functions calls which produces a particular value to be used in any other context.

The arithmetic operator / perform division and gives out the quotient as a result. The arithmetic operator % performs division and gives out the reminder as a result.

All keywords (reserved words) are basically the sequences of characters that have one or more fixed meanings.

The operator that operates on three operands is called the ternary operator.

Bit manipulation operators manipulate individual bits within a variable. Bitwise operators modify variables considering the bit patterns that represent the values they store.

The symbols that perform addition, subtraction, multiplication, modulus, and division are called arithmetic operators.

Identifiers are names given to the program elements such as variables, arrays, and functions.

It is a set of symbols that a programming language identifies and used in writing data and instructions in a programming language.

A character constant in C++ must contain one or more characters and must be enclosed in single quotation marks.

Integer constants are the whole number without any fractional part.

It consists of a sequence of digits from 0 to 9 and A, B, C, D, E, F alphabet symbols that represent decimal numbers 10,11,12,13,14, and 15 respectively preceded by ox or OX.

It consists of a sequence of digits starting with 0 (zero).

Floating-point constants are numeric values that contain decimal point and can contain exponents.

1. On the laboratory thermometer, the maximum value printed is 110°C and the lowest value is -10°C Usually a laboratory thermometer has -10° C to 110° C mark on it. It is called the range of thermometer.

2. Dip the bulb of thermometer in a liquid and wait till the level of mercury become stable. Note this reading. It is the temperature of that liquid. Let us do and observe Dip the bulb of thermometer in the three pots A, B and C (filled with water) respectively. In activity-1 and wait, till the level of mercury becomes stable.

Conclusion: We observe that the temperature of pot C is the maximum, temperature of water in Pot B is less than of C, while the temperature of water in pot A is the minimum (below 0°C).

1. The temperature of normal water has increased while the temperature of boiled water has decreased.

2. From the above experiment we conclude that heat flows from a body of higher temperature to a body of lower temperature.

3. The temperature of hot water has decreased and that of cold water has increased.

4. The exchange of heat between hot and cold water containers till the tempertaure of both become equal. Therefore, at the end of experiment temperature of both the containers becomes equal.

1. Usually, the body temperature of a healthy person is 37° C.

2. To make clinical thermometer free of any sort of infections, it is washed with antiseptic solution, before it is used.

3. To bring down the mercury level to its low position a jerk is given to thermometer every time.

Black objects are the best absorbs of heat while lustrous objects are best reflectors of heat. That is why black object absorbs maximum heat that incidents on them, while lustrous object reflects maximum heat falling on them. That is why when black and shiny objects of same size are put in sunlight, the black object becomes hotter by Sun’s radiation as compared to lustrous or shiny objects.

Handies of cooking utensiles are made up of wood or ebonite. It is because during cooking utensils made of metal become hot and can not be handled. Since ebonite or wood are bad conductor of heat, do not become hot, and we can hold them easily. So, the handles of cooking utensils are made with ebonite or wood.

Bad conductor of heat is Ebonite

Sun rays falls directly near equator as compared to the poles. As a result ocean water at equatorial line is hotter as compared to near the poles. This water being hotter remains on the surface and flows towards polar regions. The heat that flows in such a way is called hot water current. Just opposite to it, the water around the poles is heavy due to its coldness. It flows from poles to equatorial circle. These type of currents are called cold water current.

Air is bad conductor of heat. Air gets trapped in the small holes present in woollen clothes. Wool and air both being bad conductor of heat does not allow body heat to go out and thus we are protected from cold in winter.

When same amount of water, oil, sand and salt are placed in equal sized pots and then are placed in sunlight, it is observed that salt becomes heated first and then sand, water and oil respectively.

Mercury is used in laboratory thermometer.

There are three methods for heat transfer.

 They are :

1. Conduction 

2. Convection 

3. Radiation.

Difference between conduction, convection and Radiation

(c) By radiation

Conductivity of heat is more in Copper.

(b) Convection

Heat is transferred with faster speed in Radiation.

The process of changing of a solid into liquid on heating is called melting. The temperature at which a soild completely changes into liquid state is called its melting point.

To find melting point of ice: We heat ice filled beaker kept on a tripod stand by sprit lamp. When ice is completely changed into water we measure its temperature by thermometers and note it. This temperature is called melting point of ice. We find that the melting point of ice is 0°C. When any liquid is heated, it boils and this process is called boiling and the temperature at which a liquid starts boiling is called its boiling point.

To find the boiling point of milk: We take milk in a beaker and heat it by sprit lamp on a tripod stand. When milk starts boiling, we measure the temperature of milk by thermometer. The temperature at which milk starts boiling is called boiling point of milk.

1. Wax pasted on wire starts melting.

2. The piece of wax close to burning candle falls first.

3. Transfer of heat in solids is called conduction.

1. When bottom of the pot is heated the water molecules at the bottom gain heat and move up with coloured water and the colder molecules at the top move down. This is repeated so long water is heated. As a result colourful currents form set.

2. This method of transfer of heat is called convection.

3. In convection method the molecules of liquid move itself to transfer heat from one place to another.

4. In air heat is transferred by convection method.

We take normal water in one beaker and sugar mixed water in another beaker and heat them by sprit lamp on tripod stand separately. When normal water and sugar mixed water starts boiling we note temperature separately and find that the boiling point of normal water is 100° C while that of sup r mixed water is more than 100° C. It depends on the amount of sugar dissolved in water.

1. When both the hands are dipped in pot B containing normal water, left hand feels it hot while right hands feel it cool.

2. We are not able to decide whether water in pot B is hot or cold. Because at the same point of time our one hand feels it cool and other feels it hot.

3. This experiment shows that our sense of touch is not reliable to decide about the hotness or coldness of an object.

4. By measuring the temperature of an object by thermometer, we can find how hot an object is really.

5. The property of hotness or coldness of an object as compared to other objects is called temperature.

(b) By convection

1. Heat is easily transferred in the objects made of aluminium, steel spoon, iron wire, Therefore, upper end of these things have become hot.

2. Those substances in which heat is transferred easily are called good conductors of heat.

3. Materials like plastic and wood are bad conductor of heat therefore, on heating, heat is not transferred. So they become less hot.

4. Metals are good conductors of heat, food is cooked easily in the utensils made from metals. Therefore cooking utensils are made of metals which are conductor of heat, so handles of cookwares are covered with ebonite or wood to protect our hands from burning.

5. Copper is the best conductor of heat. Therefore, to cook food quickly a layer of copper is pasted at the bottom of pans made of steel.

6. Mats and carpets are bad conductor or insulator of heat, They do not absorb heat from heated floor. Therefore, it is less troublesome to walk on them during summer